Phase detector for three-phase power factor controller

Details Phase detector for three-phase power factor controller Phase detector for three-phase power factor controller

1982-12-16

1984-07-10

Rubinson, G. Z.

Electricity: motive power systems

Induction motor systems

Power-factor control

318809, 323300, H02P 126

Patent

active

044595280

ABSTRACT:
A phase-detector (16, 18, 20) is provided for use in a power factor controller for a three-phase induction motor. The power factor controller includes switching thyristors (10, 12 14) for each motor phase winding and the phase detector for each phase includes an operational amplifier (36) which senses the current phase angle for that phase by sensing the voltage across the phase thyristor. Common mode rejection is achieved by providing positive feedback between the input and output of the voltage sensing operational amplifier.

REFERENCES:
patent: 4052648 (1977-10-01), Nola
patent: 4379258 (1983-04-01), Sagimoto
patent: 4384243 (1983-05-01), Muskovac
patent: 4388578 (1983-06-01), Green et al.
patent: 4404511 (1983-09-01), Nola

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